SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02e06ae8423947e8cf4b79bad542756621f7c311b94416752cc3be603ea90a46' 
  AND token = 'dYuGWz+rTLXJdTsCVgdMvUOOdD6BNMIl7nDG3NSX7Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}